Photoperiodic Stimulation of Egg Laying in the Land Snail Helix aspersa

Stephens, Gwen J.; Stephens, Grover C.

doi:10.1038/2121582a0

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…The latter study concluded that light is a dominant signaler for inducing egg laying behavior, based on their finding that egg laying is influenced by both temperature and light, but that long-day snails produced more eggs than short-day ones. Moreover, egg laying stopped after 6 weeks of exposure to 15 °C at short days while it continued under normal conditions with 15 °C and long days (which is in agreement with Stephens and Stephens ( 1966 )). Therefore, they conclude that egg-laying hormone production is stimulated by light as in L. stagnalis .…”

Section: The Roles and Effects Of Natural And Artificial Light On Orgsupporting

confidence: 90%

Slowly seeing the light: an integrative review on ecological light pollution as a potential threat for mollusks

Hussein

Bloem

Fodor

et al. 2020

Environ Sci Pollut Res

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Seasonal changes in the natural light condition play a pivotal role in the regulation of many biological processes in organisms. Disruption of this natural condition via the growing loss of darkness as a result of anthropogenic light pollution has been linked to species-wide shifts in behavioral and physiological traits. This review starts with a brief overview of the definition of light pollution and the most recent insights into the perception of light. We then go on to review the evidence for some adverse effects of ecological light pollution on different groups of animals and will focus on mollusks. Taken together, the available evidence suggests a critical role for light pollution as a recent, growing threat to the regulation of various biological processes in these animals, with the potential to disrupt ecosystem stability. The latter indicates that ecological light pollution is an environmental threat that needs to be taken seriously and requires further research attention.

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Section: The Roles and Effects Of Natural And Artificial Light On Orgsupporting

confidence: 90%

Slowly seeing the light: an integrative review on ecological light pollution as a potential threat for mollusks

Hussein

Bloem

Fodor

et al. 2020

Environ Sci Pollut Res

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“…Chez Lymnaea stagnalis, les longues photophases stimulent la production d'oeufs (Bohlken et Joosse, 1982) et accélèrent la maturation sexuelle (Joosse, 1984). Chez l'Escargot Helix aspersa, elles favorisent la reproduction (Enée et al, 1982), tandis que les courtes photophases l'inhibent plus ou moins totalement (Stephens et Stephens, 1966 ;Enée et al, 1982). Cependant, contrairement à ce qui se passe chez des Escargots maintenus en inactivité à basse température (Gomot et al, 1986), la spermatogenèse n'est pas bloquée chez des animaux élevés en jours courts (Gomot et Gomot, 1985).…”

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Répercussion de la durée d'éclairement journalier sur l'évolution des cellules nourricières et de la lignée mâle dans l'ovotestis d'Helix aspersa

Gomot¹,

Griffond²

1987

Reprod. Nutr. Dévelop.

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Summary. The effect of lighting duration on the evolution of nurse cells and male line in the Helix aspersa ovotestis.Adult snails (Helix aspersa) were bred under two photoperiods i.e. long-day : 18 h (JL), short-day : 8 h (JC) immediately after a 4 month hibernation. In these conditions only the long-day snails began to lay eggs from the 10th week of experiment, whereas the others did not.To explain these differences, the structure and functioning of the hermaphroditic glands were investigated in both groups, 6 and 10 weeks later, using electron microscopic and quantitative biochemical methods.At 6 weeks, compared to short-day cycles (JC1, long-days (JL) highly increased spermatogonial multiplication measured by 3 H thymidine incorporation and on the other hand shortened the duration of spermatogenesis. Ultrastructural observations showed that modifications of the nurse cells were strongly correlated with the evolution of the male line.At 10 weeks, the rates of spermatogonial multiplication were rather similar in all snails.In spite of the absence of anomalies in the male cells, no reproduction occurred among the short-day animals ; this is probably due to a low concentration of sperm, suggesting an insufficient stimulation by the neuroendocrine controlling centers.Introduction.

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“…many authors took an interest in the study of the effects of photoperiod and temperature on the reproductive activity of terrestrial snails, with a particular reference to Cornu aspersum aspersa (stephens & stephens, 1966;charrier, 1980;Bailey, 1981;Enée et al, 1982;aupinel & daguzan, 1989) and Cornu aspersum maxima (Bonnefoy-claudet & deray, 1987;gomot et al, 1990). on the whole, all these works demonstrate the importance of photoperiod on the control of reproduction.…”

mentioning

confidence: 99%

Effects of temperature and photoperiod on growth and reproduction of the land snail Helix aperta Born (Gastropoda, Pulmonata)

Benbellil-Tafoughalt¹,

Sahnoune²,

Vaufleury³

et al. 2009

revec

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Résumé.— Effets de la température et de la photopériode sur la croissance et la reproduction de l’escargot Petit-gris Helix aperta Born (Gastropoda, Pulmonata).— La croissance corporelle et l’activité reproductrice de Helix aperta ont été étudiées en laboratoire de l’éclosion à la maturité, à 15° C et 20° C durant 40 semaines et selon deux photopériodes : 16 h de jour / 8 h de nuit et 8 h de jour / 16 h de nuit. Seule la température, pas la photopériode, a eu des effets significatifs sur la croissance corporelle ; les escargots élevés à 15° C se sont développés plus lentement et ont atteint un poids adulte plus petit que ceux élevés à 20° C. En revanche, les résultats ont montré une certaine interaction entre photopériode et température dans la reproduction (durée de l’activité reproductrice, nombre d’accouplements et de pontes) ainsi qu’un effet prédominant de la photopériode. Le nombre d’oeufs par ponte est apparu lié au poids des escargots. Les meilleures conditions de croissance et de reproduction de Helix aperta furent la combinaison d’une température de 20° C et d’une photopériode de 16 h de jour / 8 h de nuit.

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Photoperiodic Stimulation of Egg Laying in the Land Snail Helix aspersa

Cited by 15 publications

References 3 publications

Slowly seeing the light: an integrative review on ecological light pollution as a potential threat for mollusks

Slowly seeing the light: an integrative review on ecological light pollution as a potential threat for mollusks

Répercussion de la durée d'éclairement journalier sur l'évolution des cellules nourricières et de la lignée mâle dans l'ovotestis d'Helix aspersa

Effects of temperature and photoperiod on growth and reproduction of the land snail Helix aperta Born (Gastropoda, Pulmonata)

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